Shirt collar stiffening device



FIG. 1 is a perspective view of a shirt collar stiffening device, in a first position, showing the new design.

FIG. 2 is a front view thereof.

FIG. 3 is a rear view thereof.

FIG. 4 is a left side view thereof.

FIG. 5 is a right side view thereof.

FIG. 6 is a top view thereof.

FIG. 7 is a bottom view thereof.

FIG. 8 is a perspective view of the shirt collar stiffening device, in a second position.

FIG. 9 is a front view thereof.

FIG. 10 is a rear view thereof.

FIG. 11 is a left side view thereof.

FIG. 12 is a right side view thereof.

FIG. 13 is a top view thereof.

FIG. 14 is a bottom view thereof.

FIG. 15 is a perspective view of the shirt collar stiffening device, in a third position.

FIG. 16 is a front view thereof.

FIG. 17 is a rear view thereof.

FIG. 18 is a left side view thereof.

FIG. 19 is a right side view thereof.

FIG. 20 is a top view thereof.

FIG. 21 is a bottom view thereof; and,

FIG. 22 is a perspective view of the shirt collar stiffening device in use.

The broken lines shown in FIG. 22 depict environmental structure and form no part of the claimed design. 

CLAIM I claim the ornamental design for a shirt collar stiffening device, as shown and described. 